GardenWizzPlant Care Card

Guelder Rose

Viburnum opulus · Shrub

Hardiness

H6 Hardy — very cold winter (to −15 to −20°C)

Position

Full sun, Partial shade

Height × Spread

4–8 m × 2.5–4 m

Soil

moderately fertile, humus-rich, moist but well-drained; tolerates chalk, clay, loam, sand; pH acid, alkaline, neutral

Flowering

May–June

Toxicity

Fruit are ornamental - not to be eaten. Mildly toxic if eaten in large amounts; may cause vomiting or diarrhea.

The Gardening Year

🌱 Sow

🌸 In flower

✂️ Prune

Viburnum beetle: Hand-pick adults and larvae or apply a systemic insecticide if infestation is severe.

Aphids: Squash by hand, blast off with water, or use insecticidal soap for heavy infestations.

Phytophthora root rot: Ensure well-drained soil and avoid overwatering; remove severely affected plants.

Honey fungus: Improve drainage and air circulation; surgical removal of infected roots if possible.

Leaf spot: Remove fallen leaves in autumn to reduce spores and avoid wetting foliage when watering.